JP3593045B2 - Bumper mounting structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bumper mounting structure.
[0002]
[Prior art]
5 and 6 show an example of a conventional bumper mounting structure. FIG. 5 is a top view of a portion where the front end of a left side rail on the vehicle width direction and a bumper are mounted, and FIG. 6 is a side view thereof. 6 is a drawing taken along line VI-VI in FIG. 5.
[0003]
As shown in the figure, in a vehicle such as a large truck, the bumper 1 and the front end of the left and right side rails 2 (only the left side is shown in the figure) are directly mounted via the bumper stay 3. More specifically, a bracket portion 2a is formed integrally with a front end portion of a side rail 2 made of a channel material having a U-shaped cross section, such that only a side surface portion and a bottom surface portion are extended forward. The rear end of the bumper stay 3 is overlapped on the side surface of the bracket portion 2a and fastened with a bolt, and the front end of the bumper stay 3 is bent outward in the vehicle width direction so that the bumper stays along the rear surface of the bumper 1. 1 was bolted.
[0004]
In the drawing, reference numeral 4 denotes a cross member connecting the front ends of the left and right side rails 2 in the vehicle width direction, and the cross member 4 is formed of a channel material having a U-shaped cross section. .
[0005]
[Problems to be solved by the invention]
However, in such a conventional structure, most of the collision energy applied to the bumper 1 at the time of a vehicle collision is directly transmitted to the side rail 2 via the bumper stay 3, and the side rail 2 is deformed to damage the vehicle body. May be increased.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a bumper mounting structure capable of satisfactorily absorbing collision energy applied to a bumper during a collision and reducing damage to a vehicle body.
[0007]
[Means for Solving the Problems]
The present invention, both ends front of the cross member that connects between the front end portion of the left and right side rails in a vehicle width direction, the impact-absorbing member extending in the longitudinal direction of the vehicle forms a closed cross section, the left and right side rails Is mounted inside the web width direction of the web and between the upper and lower flanges , and covers the front opening of the shock absorbing member, protrudes outward in the vehicle width direction by closing the opening of the front surface, and projects the outer end toward the rear of the vehicle. Mounting a bracket that bends into a substantially L-shape to form an upright surface along the vehicle longitudinal direction, and attaches a bumper stay that supports the bumper from the rear side to the upright surface along the vehicle longitudinal direction of the bracket. The present invention relates to a characteristic bumper mounting structure.
[0008]
Thus, the collision energy applied to the bumper at the time of a vehicle collision is input to the upright surface of the bracket along the vehicle front-rear direction via the bumper stay and acts as a force to pull the upright surface rearward. Therefore, a force for compressing backward acts on the front surface of the shock absorbing member from a slightly offset direction, whereby the shock absorbing member is buckled and deformed prior to the peripheral structure. As a result, the collision energy is largely absorbed by the buckling deformation, so that the large collision energy does not directly act on the side rail.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0010]
1 to 4 show an example of an embodiment of the present invention. FIG. 1 is a top view of a bumper mounting structure of the present embodiment, FIG. 2 is a side view thereof (a II-II arrow in FIG. 1), FIG. 3 is a view taken in the direction of arrows III-III in FIG. 2, and FIG. 4 is a view taken in the direction of arrows IV-IV in FIG. 2. The parts denoted by the same reference numerals as those in FIG. 5 and FIG. .
[0011]
As shown in this figure, in the present embodiment, the bracket portion integrally formed at the front end portions of the left and right side rails 2 in the conventional structure is eliminated, and the space between the front end portions of the left and right side rails 2 is eliminated. A cylindrical crash box 5 (shock absorbing member) that forms a closed cross section and extends in the vehicle front-rear direction is provided on the front surface of both ends of a cross member 4 formed of a channel member having a U-shaped cross section connected in the vehicle width direction. It is designed to be mounted via the mounting seat 7.
[0012]
Here, the crush box 5 is formed of a relatively thin wall and has a structure that is easily buckled by a strong external force from the front. The buckling deformation allows the energy of the external force from the front to be absorbed. It is.
[0013]
The mounting seat 7 interposed between the rear end of the crash box 5 and the front surface of the end of the cross member 4 has, for example, a substantially rectangular shape as shown in FIG. Bolts are fastened to the front surface of the end, and the rear end of the crash box 5 is located inside the web of the left and right side rails 2 in the vehicle width direction and between the upper and lower flanges. Welded.
[0014]
The front surface of the crash box 5 covers the opening of the front surface and protrudes outward in the vehicle width direction, and its outer end is bent in a substantially L-shape (see FIG. 1) toward the rear of the vehicle so as to extend in the vehicle front-rear direction. The bracket 6 is formed so as to form an upright surface 6a.
[0015]
Further, the rear end of the bumper stay 3 is overlapped and bolted to an upright surface 6a along the vehicle front-rear direction of the bracket 6, and the front end of the bumper stay 3 is bent outward in the vehicle width direction. Then, bolts are fastened to the bumper 1 along the rear surface of the bumper 1.
[0016]
The bracket 6 may be reinforced by appropriately attaching a rib or the like (not shown) to the edge.
[0017]
Thus, if such a structure is adopted, the collision energy applied to the bumper 1 at the time of a vehicle collision is input to the upright surface 6a of the bracket 6 along the vehicle front-rear direction via the bumper stay 3, and the upright surface 6a is moved backward. Therefore, the rearward compressing force acts on the front surface of the crush box 5 from a slightly offset direction, so that the crush box 5 is buckled and deformed prior to the peripheral structure. As a result, the collision energy is largely absorbed by the buckling deformation of the crash box 5, so that the large collision energy is prevented from directly acting on the side rail 2.
[0018]
Therefore, according to the above embodiment, the collision energy applied to the bumper 1 at the time of collision can be favorably absorbed by buckling and deforming the crash box 5, and the large collision energy directly acts on the side rail 2. Since the risk of occurrence can be avoided beforehand, damage to the vehicle body at the time of collision can be significantly reduced as compared with the related art.
[0019]
It should be noted that the bumper mounting structure of the present invention is not limited to the above-described embodiment, and that the shape of the closed cross section of the shock absorbing member is not limited to the illustrated example. It is needless to say that various changes can be made within.
[0020]
【The invention's effect】
According to the bumper mounting structure of the present invention described above, the collision energy applied to the bumper at the time of collision can be favorably absorbed by buckling deformation of the shock absorbing member, and the large collision energy directly acts on the side rail. Since it is possible to avoid the possibility that the vehicle body will be damaged beforehand, it is possible to obtain an excellent effect that damage to the vehicle body at the time of a collision can be significantly reduced as compared with the related art.
[Brief description of the drawings]
FIG. 1 is a partially cutaway top view showing an example of an embodiment of the present invention.
FIG. 2 is a view in the direction of arrows II-II in FIG.
FIG. 3 is a view in the direction of arrows III-III in FIG. 2;
FIG. 4 is a view in the direction of arrows IV-IV in FIG. 2;
FIG. 5 is a partially cutaway top view showing a conventional example.
FIG. 6 is a view in the direction of arrows VI-VI in FIG. 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bumper 2 Side rail 3 Bumper stay 4 Cross member 5 Crash box (shock absorbing member)
6 Bracket 6a Standing surface

Claims (1)

At both ends front of the cross member that connects between the front end portion of the left and right side rails in a vehicle width direction, the impact-absorbing member extending in the longitudinal direction of the vehicle forms a closed cross section, drive from the web of the left and right side rails Attach so as to fit inside the widthwise inner side and between the upper and lower flanges , cover the opening of the front surface of the shock absorbing member, project outward in the vehicle width direction, and make the outer end thereof substantially L-shaped toward the rear of the vehicle. A bumper comprising a bracket which is bent into a mold to form an upright surface along the vehicle front-rear direction, and a bumper stay for supporting the bumper from the rear side is mounted on the upright surface of the bracket along the vehicle front-rear direction. Mounting structure.

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